This is a very simple circuit.  What I will do in the next few days is
post a netlist of how I built my version of the circuit.  For the
original version, I would
refer to the magazine, as this is the most current issue.

The ftp site of the software is
ftp://ftp.gernsback.com/pub/EN/logprobe.zip
This ftp site is the property of the magazine, however when I logon they
do not
ask for passwords or if I am a subscriber.  Therefore everyone should
have access.  The software contains a warning screen, stating that the
software may only be posted on the Electronics Now BBS.  There are no
stated restrictions on the use of the software that I have seen.  So,
legally you must retrieve it from their site.

 --- Steve

 ----------
From:  pic microcontroller discussion [SMTP:PICLIST@MITVMA.MIT.EDU]
Sent:  Tuesday, December 10, 1996 3:55 PM
To:  Multiple recipients of list PIC
Subject:  Re: Printer Port Analyzer Results




>>:
>>: Conclusion:
>>:
>>: While the device has some warts on it.  I can see this type of device
>>: being useful to troubleshoot and debug interface issues like I2C
buses,
>>: SPI buses, LCD control interfaces, keyscans, etc.   Though limited,
it
>>: only cost me two small ICs,  a 7805, and a DB25 connector.
>>:
>>:  ----- Steve
>>:

>Is it possible to public your design (and eventually the software, if
the
>magazine allows) in the net. It will benefit the people who do not live
in
>USA and either have no access to the magazine, or it would too expensive
to
>get.


>Regards.
>Movahedin


>Munich,
>Germany